Pull ring



June 24, 1941. 1.1-: ROY BURDETT PULL RING Filed May 15, 1940 Flg2..

11 VEN TO A.

Patented June 24, 1941 UNITED STAT PULL RING Le Roy Burdett, Chicago, 111., assignor to Standard Shade Pull Manufacturers, 1110., Chicago, 111., a corporation of Illinois Application May 15, 1940, Serial No. 335,375

Claims.

This invention relates to pull rings in general and more particularly to the construction of the core of the pull ring.

Pull rings generally comprise a core in the form of circular discs having a central hole therethrough, which core is covered by a sheathing generally crocheted around the core. Such pull rings are used in a number of places as, for instance, at the end of a string or cord for drawing curtains, window shades, or the like. It is an object of the present invention to provide a core for such pull rings, which core is simple of construction and economical of manufacture and does not necessitate the waste of material.

In accordance with the present invention the core is made of a single length of wire which is curled to an oval or circular shape, preferably of more than one turn, and with the ends of the wire on the inside and outside of the ring so tapered that the resulting ring is of uniform internal and uniform external diameter and substantially free of sharp edges.

The attainment of the above and further objects of the present invention will be apparent from the following specification taken in conjunction with the accompanying drawing forming a part thereof.

In the drawing:

Figure 1 is a view of a length of wire suitably shaped for curling into a ring;

Figure 2 is a view corresponding to Figure 1 and taken at right angles thereto;

Figure 3 is an enlarged plan view of a ring made from the wire of Figure 1;

Figure 4 is a sectional View taken along the line 4-@ of Figure 3; and

Figure 5 is a view of the completed pull ring utilizing the core of Figure 3, with some of the crocheted sheathing broken away to show the core construction.

Reference may now be had more particularly to Figures 1, 2 and 3. In Figure 1 there is shown a length of metal wire I, the ends of which are cut at an angle, as indicated at 2 and 3, both ends being cut at the same angle from one continuous length of wire. An offset 4 is formed at the center of the wire, said offset being at an angle to the axis of the wire approximately the same as the angle of the beveled cut edges 2 and 3. The corners 5 and 6 and the offset 4 are preferably formed rather sharp. The wire used is preferably of circular cross section, although it is within the purview of the present invention to use a wire of a different cross sectional shape.

To form the ring of Figure 3 the wire of Figure 1 is bent to form two concentric rings, as indicated in Figure 3, with the part 8 of the wire forming a complete circular loop about the offset part 4 and the part 9 forming a similar loop, with the looped part 9 on the inside of the looped part 3. To effect such result the part 8 is of slightly greater length than the part 9 due to the difference in diameters of the outer and inner circles. At this time the tapered edge 3 lies in contact with the surface 1 and the tapered edge 2 lies in contact with the surface 1. There is therefore substantially no spacing between the edge 3 of the wire and the oliset part 4, nor between the edge 2 and the oiiset part.

The ring thus formed thus constitutes the core of a pull ring. The pull ring is made by crocheting a continuous cord l2 about the core I0 in the form of. a sheathing 53. This crocheting may be done in any desired manner as, for instance, by the machine illustrated in my Patent No. 2,142,- 108, issued January 3, 1939, to which reference may be had for a more complete description of the manner of forming the crocheted sheathing.

In compliance with the requirements of the patent statutes I have here shown and described a preferred embodiment of my invention. It is, however, to be understood that the invention is not limited to the precise construction here shown, the same being merely illustrative of the principles of the invention. What I consider new and desire to secure by Letters Patent is:

1. A pull ring comprising a core of a continuous length of circular wire bent to form a plurality of concentric rings, and a sheathing encasing the concentric rings.

2. A pull ring comprising a core of two turns of one continuous circular wire in ring formation with the ends of the wire beveled to form a continuous smooth surface with the adjacent part of the ring, and a sheathing of cords encasing the ring.

3. A pull ring comprising a core of at least two concentric turns of one continuous wire, the difference in radius of the two turns being substantially equal to the diameter of the wire, the inner and outer turns being joined by a part inclined at an angle to the periphery of the ring, and the opposite edges of the wire being beveled at a corresponding angle and abutting the inclined part, and a fabric sheathing encasing the ring.

4. A pull ring comprising a core of at least two concentric turns of circular wire, the outer turn snugly embracing the inner turn, the ends of the turns being beveled to prevent any abrupt change by a part inclined at an angle to the periphery of the ring, the opposite edges of the wire bein beveled at a corresponding angle and each abutting an inclined part, whereby the thickness of the turned wire in a direction radially of the turns is substantially uniform and a multiple of the diameter of the Wire and the thickness axially of the turns is equal to the diameter of the wire, and a sheathing of fabric cords encasing the 10 turns,

LE ROY BURDETT. 

